Traditional　ultrasonic　guided　wave　exciting　signal　is　window-function-modulated　sinusoidal　signal.　Its　obvious　advantage　is　narrow　frequency　bandwidth,　which　can　greatly　restrain　dispersion.　However,　this　kind　of　signal　needs　to　change　its　center　frequency　in　frequency　sweeping　test,　as　well　as　multi-frequency　and　multi-mode　test.　Besides,　in　order　to　achieve　high　SNR　(signal-to-noise　ratio),　the　acquisition　process　of　each　test　usually　requires　hundreds　of　times　averaging,　which　is　time　and　energy　consuming.　A　new　method　is　proposed,　which　uses　linear-chirp　and　Gaussian-chirp　signals　as　the　exciting　signal　of　ultrasonic　guided　wave.　Linear-chirp　signal　has　a　wide　frequency　bandwidth,　and　its　processed　inspection　signal　is　equal　to　the　received　signal　using　traditional　window-function-modulated　sinusoidal　signal;　and　its　center　frequency　could　be　any　value　within　the　bandwidth　of　linear-chirp　signal,　thus　it　is　very　suitable　for　frequency　sweeping　test,　as　well　as　multi-frequency　and　multi-mode　test.　Gaussian-chirp　signal　has　the　same　amplitude-frequency　characteristic　as　that　Gaussian　windowed　sine　wave　has,　however　it　can　achieve　the　same　SNR　just　with　one　test　as　that　traditional　exciting　signal　achieves　that　needs　hundreds　of　times　averaging　acquisition　processes.　Therefore　this　method　is　time　and　energy　saving.　Experiment　was　carried　out,　in　which　two　piezoelectric　wafers　placed　on　the　surfaces　of　aluminum　plates　were　used　to　generate　Lamb　waves.　Experiment　results　verify　the　effectiveness　of　the　proposed　method　that　uses　these　two　kinds　of　chirp　signals　to　excite　ultrasonic　guided　wave　and　carry　out　subsequent　signal　processing.